Java tutorial
//package com.java2s; /* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Paint; public class Main { private static Bitmap resizeBitmapByScale(final Bitmap bitmap, final float scale, final boolean recycle) { final int width = Math.round(bitmap.getWidth() * scale); final int height = Math.round(bitmap.getHeight() * scale); if (width == bitmap.getWidth() && height == bitmap.getHeight()) return bitmap; final Bitmap target = Bitmap.createBitmap(width, height, getConfig(bitmap)); final Canvas canvas = new Canvas(target); canvas.scale(scale, scale); final Paint paint = new Paint(Paint.FILTER_BITMAP_FLAG | Paint.DITHER_FLAG); canvas.drawBitmap(bitmap, 0, 0, paint); if (recycle) { bitmap.recycle(); } return target; } private static Bitmap.Config getConfig(final Bitmap bitmap) { Bitmap.Config config = bitmap.getConfig(); if (config == null) { config = Bitmap.Config.RGB_565; } return config; } }